Is it possible to print an objects contents e.g. methods and attributes in Node.js?
At the moment I'm trying to print the session object and get the following:
console.log("Session:" + session);
> Session:[object Object]
Maybe in a similar way to print_r(array) in PHP, or using .toString in Java.
Try this one:
console.log("Session: %j", session);
If the object could be converted into JSON, that will work.
console.log("Session: %O", session); developer.mozilla.org/en-US/docs/Web/API/…
function prettyJSON(obj) {
console.log(JSON.stringify(obj, null, 2));
}
// obj -> value to convert to a JSON string
// null -> (do nothing)
// 2 -> 2 spaces per indent level
To have an output more similar to the raw console.log(obj) I usually do use console.log('Status: ' + util.inspect(obj)) (JSON is slightly different).
This will work with any object:
var util = require("util");
console.log(util.inspect(myObject, {showHidden: false, depth: null}));
null. Inspect has built-in treatment for circular references.console.dir() is the most direct way.
console.dir with the depth argument set will do the trick. This will print JSON objects to any arbitrary depth. Depth:null means print every level.
console.dir(someObject, { depth: null })
console.log(obj);
Run: node app.js > output.txt
This will for most of the objects for outputting in nodejs console
var util = require('util')
function print (data){
console.log(util.inspect(data,true,12,true))
}
print({name : "Your name" ,age : "Your age"})If you are still looking for some options, there is a NPM package that might help you, a drop-in replacement for console.log called console-log-json. The nice thing about it is that it will create consistent JSON formatted logs, despite the fact that you can throw at console.log() any number of parameters in any order, including other JSON objects as well as Error objects and plain strings.
It also handles automatically adding some extra helpful attributes such as time stamps and file where the console.log() was called from, etc..
These all get printed to STDOUT so any log shipping and aggregator can pick it up and parse the JSON.
console.log("Session:" + util.inspect(session))